[Discuss-gnuradio] really get to zero Hz

[Hans Glitsch]

Hi,

 

I want to frequency shift my signal down to zero Hz.  I can do that with the ddc and a freq_xlating_fir_filter block, but there is always some frequency error.  Is there a block that will auto fine tune the shift frequency so the output is as close as possible to 0 Hz?

 

If so, is there an example of how to use it?

 

Another potential complication is that there is no constant carrier for the signal I'm receiving.

 

Thanks,

Hans

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